docs: sync the key table in the CLI reference

[kleyt0n]

Problem

docs/reference/cli.md:101-114 omits four keys that handle_key implements (src/main.rs:230-257) and that docs/guide/dashboard.md:37-41 documents:

Key	Action
enter	toggle pane focus
d	detail rows
[ / ]	move bucket
backspace	clear bucket

Two key tables that disagree; the reference is the incomplete one.

What to do

• Add the four rows to docs/reference/cli.md.
• Check the two tables match in full, not just for these four.

Acceptance

The CLI reference and the dashboard guide list the same keys.